[1] Argonne Natl Lab, Midwest Ctr Struct Genom, Argonne, IL 60439 USA
[2] Argonne Natl Lab, Struct Biol Ctr, Biosci, Argonne, IL 60439 USA
[3] Univ Virginia, Charlottesville, VA 22908 USA
[4] European Bioinformat Inst, Cambridge CB10 1SD, England
[5] Univ Texas Southwestern Med Ctr Dallas, Dallas, TX 75390 USA
[6] Univ Toronto, Banting & Best Dept Med Res, Toronto, ON M5G, Canada
[7] Univ Hlth Network, Clin Genom Ctr Prote, Toronto, ON M5G 1L7, Canada